Urine, whether a male or female dog, or human for that matter, will tend to kill grass, yes.
Yes, their urine is stronger than a male dog.
You cant. Only female dogs do it and there is no way to prevent it.
The ash of burnt grass.
You can buy a product called Dog Rocks and put it in your dogs bowl. It helps neutralize the acid content in the dogs urine and the spots in the grass should stop being so noticable.
Burn it
I think, (not sure) it's because they are itching their backs
In the grass
This is because of the scidity of the dogs urine. The type of grass you have can not tolerate that much acid and the roots are probably dying. The best thing to do is spray water onto the spot, right after your dog urinates. This will dilute the acid and hopefully save your grass.
Dogs eat grass to help digest their food.
No. Some female dogs frequently urinate in the same spot all the time. Vinegar will not keep her urine from killing a spot in the grass.
yes
In green grass, water is present, and this prevents it from burning.
Black Mondo grass is not poisonous to dogs. However, it is not a good idea to allow your dog to eat grass of any kind.